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<p>Fipronil is a neurotoxic insecticide used in sugarcane fields that disrupts central nervous system activity by targeting glutamate-activated chloride and gamma-aminobutyric acid (GABA)-gated channels, posing serious health risks. This study developed a novel fluorescent molecularly imprinted polymer (MIP) to detect and extract fipronil from sugarcane juice. The fluorescent MIP demonstrated a high binding capacity of 31.90&#xa0;mg g⁻¹ with optimal extraction conditions identified as 30&#xa0;min of contact time, pH 8, and 25&#xa0;mg of adsorbent. Desorption of the analyte was most efficient in acidic conditions. Material characterization was performed using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM). Real sample analysis confirmed the successful detection and removal of fipronil using UV-Vis spectrophotometry, achieving an extraction efficiency of 86%. The method demonstrated good sensitivity, with a limit of detection (LOD) of 3.3 mg L<sup>−1</sup> and a limit of quantification (LOQ) of 10 mg L<sup>⁻1</sup>. The adsorption process followed the Freundlich isotherm, pseudo-first-order kinetics. Notably, the Chitosan/GO-MIP demonstrated outstanding reusability, maintaining over 97% efficiency in water and over 65% in sugarcane juice after five cycles. Overall, this GO/Chi-based fluorescent MIP offers a promising, efficient, and selective approach for extracting fipronil from complex food matrices, supporting its potential application in food safety and environmental monitoring.</p>

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Synthesis of Fluorescent Molecularly Imprinted Polymer with Magnetic Chitosan/Graphenen Oxide Composite for Extraction of Fipronil from Sugarcane Juice

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Nosheen Majeed,
  • Muhammad Sajid,
  • Zeeshan Ali,
  • Muhammad Hayat,
  • Waseem Hassan,
  • Muhammad Jamil

摘要

Fipronil is a neurotoxic insecticide used in sugarcane fields that disrupts central nervous system activity by targeting glutamate-activated chloride and gamma-aminobutyric acid (GABA)-gated channels, posing serious health risks. This study developed a novel fluorescent molecularly imprinted polymer (MIP) to detect and extract fipronil from sugarcane juice. The fluorescent MIP demonstrated a high binding capacity of 31.90 mg g⁻¹ with optimal extraction conditions identified as 30 min of contact time, pH 8, and 25 mg of adsorbent. Desorption of the analyte was most efficient in acidic conditions. Material characterization was performed using Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM). Real sample analysis confirmed the successful detection and removal of fipronil using UV-Vis spectrophotometry, achieving an extraction efficiency of 86%. The method demonstrated good sensitivity, with a limit of detection (LOD) of 3.3 mg L−1 and a limit of quantification (LOQ) of 10 mg L⁻1. The adsorption process followed the Freundlich isotherm, pseudo-first-order kinetics. Notably, the Chitosan/GO-MIP demonstrated outstanding reusability, maintaining over 97% efficiency in water and over 65% in sugarcane juice after five cycles. Overall, this GO/Chi-based fluorescent MIP offers a promising, efficient, and selective approach for extracting fipronil from complex food matrices, supporting its potential application in food safety and environmental monitoring.